ABB RELION SMU615 Technical Manual page 249

1MRS758407 C
U
0
U
=
1
U
2
When
sequence voltage components are calculated from the phase-to-phase voltages
according to the equations:
U
1
=
U
2
The phase-to-earth voltages are calculated from the phase-to-phase voltages when
VT connection is selected as "Delta" according to the equations.
U
A
U
B
U
C
If the U
The phase-to-phase voltages are calculated from the phase-to-earth voltages when
VT connection is selected as "Wye" according to the equations.
U
AB
U
BC
U
CA
SMU615
Technical Manual
( U U U ) / 3
= + +
A B C
2
( U a U a U ) /
+ ⋅ + ⋅
A B C
2
( U a U a U ) /
= + ⋅ + ⋅
A B C
VT connection is selected as "Delta", the positive and negative phase
2
( U a U ) / 3
AB BC
− ⋅
( U a U ) / 3
AB BC
= − ⋅
( )
= U + U − U 3 /
0 AB CA
( )
= U + U − U / 3
0 BC AB
( )
= U + U − U / 3
0 CA BC
channel is not valid, it is assumed to be zero.
0
U U
A B
= −
U U
= B − C
U U
C A
= −
3
3
General function block features
(Equation 21)
(Equation 22)
(Equation 23)
(Equation 24)
(Equation 25)
(Equation 26)
(Equation 27)
(Equation 28)
(Equation 29)
(Equation 30)
(Equation 31)
249